利用凹球面镜抑制全息存储叠置噪音

Overcoming of Superimposed Noise in Holographic Storage with Concave Mirror

在三维体全息信息存储中,全息图叠置将引起信息读出噪音。利用凹球面反射镜反射光进行信息读出,有效抑制了全息图叠置造成的噪音,实现了存储信息的无叠置噪音读出。结果显示,反射镜反射光进行信息再现可以使信噪比(SNR)由4.80提高到7.04,误码率(BER)从10-4量级降低到10-6量级。

Superimposed holograms in 3-dimensional volume holographic storage will introduce noise into the readout messages. A simple way to suppress the noise caused by the superimposed holograms was introduced. In our method, holograms were recorded by convergent reference beam. We made the convergent point of the beam overlap the curvature center of a concave mirror. The reflected beam from the concave mirror was used to readout the holograms. By this method, we suppress the noise caused by Superimposed holograms and realize noise-free readout in holographic storage, and the signal-to-noise ratio (SNR) enhance from 4.80 to 7.04, and the bits-error ratio (BER) is improved from 5.4 × 10-4 to 1.0 × 10-6.